FPCN39 CWLW 091353
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PST TUESDAY 9 FEBRUARY 1999 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL       9    1     500   0    100    4    2000   5
KAMLOOPS     KEL       9    0     500   0    100    3    2000   5
OKANAGAN     KEL       9    0     500   0    100    4    2000   5
CASTLEGAR    SPOK     26    0    1100   3    100    3    2000   5
CRANBROOK    SPOK     31   -4    1100  13    100    0    2000   5
REVELSTOKE   KEL       9    0     550   0     38    2    2000   5

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  13   W   24
CRANBROOK             W    9   W   22

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: FAIR.

CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.      9   -8     950   9     70   -3    1500   3
PR. GEORGE   P.G.      9   -7     700  10     25   -3    1100   3
SMITHERS     P.G.     10  -10     650   1     15   -5     800   3
FT NLSN      F.N.      9  -24     400   0      9  -20     400   0
FT STJOHN    F.N.     32  -13    1200   5     42  -10    1300   6

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  24   SW  31
SMITHERS              S   20   S   31

TODAY'S VENTING: VARIABLE.

VENTING FOR WEDNESDAY: FAIR.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     59    2     450  18    100    5    1900   8
FRASER VLY   QUIL     37    1     250  18    100    5    1850   8
SRN VRISL    QUIL      9    2     300   0    100    5    1600   8
CNTRL VRISL  QUIL      9    2     300   0    100    5    1650   8
NRN VRISL    HRDY     10    1     100   1    100    3    2500  10
TERRACE      ANT       9   -3     200   8     75   -1     950  10
STEWART      ANT       9   -6     100   5     10   -3       0   2

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   22   S   28   SW  31
PORT HARDY   SW  24   SW  31   SW  37
SANDSPIT     W   22   W   28   SW  30

TODAY'S VENTING: GOOD.

VENTING FOR WEDNESDAY: GOOD

VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.


END/KJ